ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 25, Number 4
JKCSEZ 25(4)
August 20, 1981 

Al(Ⅲ) and Cr(Ⅲ) were determined selectively by colorimetry of Bismark Brown R {4,4'[(4-methyl-1,3-phenylene)bis(azo)]-bis(6-methyl-1,3-benzenediamine) dihydrochloride} in the presence of the various cations and anions without the using of any masking agents, but tartrate and citrate ions were interfered. The ligand of Bismark Brown R and complexes of Al(Ⅲ) and Cr(Ⅲ) were shown the maximum absorbance at the same wavelength together and both metallic ion were interfered to determine each other, but Al(Ⅲ) were able to determine after oxidation of Cr(Ⅲ) to Cr(Ⅵ).